Have been doing a bit more investigation into this naked calendar phenomenon.
There's this website devoted to listing nude calendars.
Besides the content, there's some great titles:
Beauty and the Bass (fishing based nudity)
Men of Mortuaries
Bare Because We Care
Apparently, there's even a calendar called Highway 32 Pothole Calendar where townspeople from Western Canada wereso fed up with the rotten state of their main road that they posing nude in the potholes as a form of protest.